Improvement in sand-screen



@sind @twine CHARLES LOCKWOOD, OF HAVERSTRAW, NEW YORK.

Letters Patent No. 91,353, dated June 15, 1869.

IMPRO'VEMENT IN SAND-SCREEN.

The Schedule referred to :in these Letters Patent and making part of thesame.

To all whom tt may concern.-

Be it known that I, CHARLES LocKwooD, of Haverstraw, in the county ofRockland, and State of New York, have invented a new and improved MasonsSand-Screen; and I do hereby declare that the following is a full,clear, and exact description thereof, which will enable others skilledin the art to make and use the same, reference being had to theaccompanying drawing, forming part of 'this specification, inWhch-Figure l is a frontview'of my improved screen.

Figure 2 is a longitudinal section of the same, taken through the line:o-x, g. v1.

Figure ,3 is a detail cross-section of the same, taken through the liney-y, tig. 1.

Figure 4 is a detail cross-section of the same, taken through the linez-z, iig. 1.

Similar letters of reference indicate corresponding parts.

It consists in the screen, constructed in the manner hereinafter 1morefully described.

A A are the side bars of the screen, which are light metal bars,connected to each other, and held in their properrelative positions bythe cross-rods vor bars B, the ends of which pass through and areriveted to the said side bars A.

G G are the longitudinal wires of the screen, the size, number, anddistance apart of which depend upon the particular use to which thescreen is to be applied. y

'I he wires G are securely held in their proper relative positions bybeing passed through holes in the narrow plates D, near their upperedges, as shown in Iigs. 3 and 4.

The upper edges of the plates D may be cut off nearly upon a level withthe outer surfaces of the wires C, as shown in iig. 4, or they may bescalloped, as shown in tig. 3, according to the use for which the screenis intended.

The lower edges of the plates D are bent downward, so as to clasp therods B, as shown in fig. 2.

'lhe lower ends of the wires C are bent around the lower cross-rod B,and their upper ends are bent so as to clasp the upper plate D, as shownin fig. 2.

The upper part ofthe side-bars A is bentor curved forward, as shown infig. 2, so as to more squarely receive the material to be screened, asit is thrown from the shovel.

The screen A B C D is surrounded with a Wooden frame, E, made somewhatsimilar to the frame of an ordinary screen, and detachably secured inplace by pins passing through the said wooden frame, and through eyes orloops formed upon or attached to the side bars A ofthe screen, andentering recesses iu the side bars ofthe said wooden frame E.

The space between the upper end of the screen A B G D, and the top-endboard of the frame E, may be covered with a narrow plate, I", to preventthe material being screened from getting into said space.

G is the supporting-stake, the lower end of which is pointed, to take afirmer hold. upon the ground, and the upperend of which is rigidlyattached to a crossbar, H, the ends of which are pivoted to the upperends ofthe spring-bars I; the lower' ends of which are pivoted to theside bars A ofthe screen.

When the screen is in use, the springs I and stake G are extended, asshown in fig. 2, to support` the screen at any desired inclination, thesprings I bearing against the cross-bars of the screen, or against adetachable rod, J, passed through holes in the wooden frame of thescreen, according as it is desired that the screen should have less ormore elasticity.

When the screen is not in use,the spring-bars I and stake G may befolded up along the under side of the screen, and secured in place bythe detachable rod J, as shown in iig. 1.

Having thus described my invention,

What I claim as new, and desire to secure by Letters Patent, is-

1. An improved screen, formed by the combination of the side bars A,cross-bars B, longitudinal Wires O, and plates D, with each other andwith the detachable wooden frame E, substantially as herein shown anddescribed, and for the purpose set forth.

2. The combination of the stake G, cross-bar H,

v'springs I, and detachable rod J, with each other and with the screen AB O D E, substantially as herein shown and described, and for thepurpose set forth.

The above specification of my invention signed by me, this 29th day ofMarch, 1869.

CHARLES LOGKWOOD.

Witnesses:

FRANK BLocKLnY, JAMES T. GRAHAM.

